Electricity should deform the conductor then why doesn't it?@Bhavesh: Did you read the whole article? It says: "Now everyone will rightly tell me that the protons within wires cannot flow, while the electrons can. Yes, this is true... but only true for metals. And it's only true for solid metals. All metals are composed of positively charged atoms immersed in a sea of movable electrons. When an electric current is created within a solid copper wire, the "electron sea" moves forward, but the protons within the positive atoms of copper do not. "

How does water pressure manifest itself on the molecular level?Just a note: That's 8 overt questions (containing about 15 question marks) in one Physics.SE question. If you find your question doesn't get the attention you expect. you might consider re-composing it in a more succinct form concentrating on fewer points.

Forces acting on a ball when its squeezedThis is more of an engineering problem than a physics problem isn't it? Also you don't specify important factors like size of ball, whether ball is desk-mounted or free, whether the hand holds the ball or rests on it, size of hand, number of degrees of control needed and so on. Fortunately you have two-built-in sensor-rich appendages (AKA fists) you can use for empirical testing. Mine suggest the answer is "under the fingertips". Your Mileage May Vary.